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Credit: AFP/Getty Images

WASHINGTON, : US clergyman and civil rights leader Martin Luther KIng (ctr, rt.) and other major American leaders of the Black civil rights movement (l-r) John Lewis, Whitney Young, Philip Randolph, M. L. King, James Farmer and Roy Wilkins, meet 06 March 1963 in New York during a meeting dedicated to the organization of the "March on Washington", held 28 August 1963 to promote civil rights for Afro-Americans. Martin Luther King was assassinated 04 April 1968 in Memphis, Tennessee. James Earl Ray confessed to shooting King and was sentenced to 99 years in prison. King's killing sent shock waves through American society at the time, and is still regarded as a landmark event in recent US history. (Photo credit should read AFP/AFP/Getty Images)